Try these:

=IF(SUM(AB7:AG7)<0,(LOOKUP(99^99,E:E)+SUM(AB7:AG7 ))/(LOOKUP(99^99,C:C)+SUM(AB4:AG4)),"")

=IF(AB15<"",IF(AB14<"",(((AB15+LOOKUP(99^99,C:C) )*AB14)-LOOKUP(99^99,E:E))/AB15,""),"")

--
HTH,

RD

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"JBoyer" wrote in message
...
I have the following two functions in the following cells on my worksheet.

AJ10 =IF(SUM(AB7:AG7)<0,(E47+SUM(AB7:AG7))/(C47+SUM(AB4:AG4)),"")

AJ17 =IF(AB15<"",IF(AB14<"",(((AB15+C47)*AB14)-E47)/AB15,""),"")

The first formula uses C47 and the second uses C47 and E47. These cells
were
the last row of my sheet when I made them. However this row changes and
row
57 is now the last row. I need help setting up my formulas so they update
accordingly.